Vernier calliper

Vernier calipers are used for more accurate measuring than can be achieved with a measuring ruler. It is capable of measuring internal and external dimensions and can also be used as a depth gauge. 

1. External jaw
2. Intenal jaw
3. Sliding jaws
4. Metric Vernier scale
5. Locking screw
6. Main scale
7. Depth gauge

1. Measuring external dimensions
2. Measuring internal dimensions
3. Measuring depth dimensions


MEASURING WITH  METRIC VERNIER CALIPER TO WITHIN 0,02mm

Each division on the main scale is 1mm.
The metric vernier scale is 49mm long and divided into 50 equal parts. Each division is 49/50, which is equal to 0,98mm. The difference between one division on the main scale and one division on the metric vernier scale is 1/50 or 0,02mm.

Read the measurement as shown above.

To read the measurement note the main scale measurement immediately preceding the zero line on vernier scale.

The zero of the vernier scale immediately preceding  28mm.

To this (28mm) must be added the decimal reading on the vernier scale. Note the line on the vernier scale which is coincident with a line on the main scale.

30th line concides with a line on the main scale.

So the reading is  28mm plus 30 divisions of 0,02mm
TOTAL: 28mm + 30 * 0,02 = 28,6mm